I don't find the drag on this car to be very high. I'm guessing the distance you can glide in "N" is not much further than what you get in "D" and you'd get no benefit from regen so that when you do accelerate back to speed you're doing it all with your ICE.

I don't really think "pure" gliding is safe on most roads. I just took another trip tonigh of 45 miles and averaged 46 mpg. I did it driving 40 to 45 on a rural road that parallels the interstate (where I would typically get 38 mpg on the same trip). That probably doesn't save me a lot of money, but it doesn't take that much longer, there is no traffic and it's more relaxing. However if I was gliding from 45 to 30 over and over that would not be relaxing. I'm pretty fanatical about the FE thing but I'm not "over the edge" yet and don't see me practicing that style of driving.